Seat device

Abstract

A pair of first and second front leg members support a seat cushion on the floor. Each of the first and second front leg members is fixed to the floor. A third rear leg member for supporting the seat cushion is fixed to the seat cushion. A pair of first and second seat slide mechanisms for allowing the seat cushion to slide relative to the floor each has (1) a lower rail fixed to one of the first and second front leg members and (2) an upper rail fixed to the seat cushion. A third seat slide mechanism allows the third rear leg member to move relative to the floor.

What is claimed is:  
     
       1. A seat device comprising: 
       a seat cushion;  
       a pair of first and second front leg members for supporting said seat cushion on a floor, each of the first and second front leg members being adapted to be fixed to the floor;  
       a third rear leg member for supporting said seat cushion, said third rear leg member being fixed to said seat cushion;  
       a pair of first and second seat slide mechanisms for allowing said seat cushion to slide relative to the floor, each of said seat slide mechanisms comprising a lower rail fixed to one of said first and second front leg members and an upper rail fixed to said seat cushion and slidably engaged with said lower rail; and  
       a third seat slide mechanism for allowing said third rear leg member to slide relative to the floor.  
     
     
       2. A seat device according to claim  1 , wherein each said lower rail has a length that is shorter than that of each said upper rail such that each said lower rail is substantially concealed by each said upper rail even when said seat cushion is moved to foremost and rear-most positions. 
     
     
       3. A seat device according to claim  1 , wherein the length of each said lower rail is ¼ to ½ the length of each said upper rail. 
     
     
       4. A seat device according to claim  1 , wherein said third seat slide mechanism comprises a caster disposed at a lower end portion of said third rear leg member. 
     
     
       5. A seat device according to claim  1 , wherein said third seat slide mechanism comprises a guide rail adapted to be fixed on said floor, said third rear leg member being slidably engaged at a lower end thereof with said guide rail. 
     
     
       6. A seat device according to claim  5 , wherein said third seat slide mechanism further comprises a sliding rail formed on said lower end of said third rear leg member, said sliding rail being slidably engaged with said guide rail. 
     
     
       7. A seat device according to claim  5 , wherein said guide rail is adapted to be fitted in a groove formed on said floor, and wherein said sliding rail of said third rear leg member has a length shorter than that of said guide rail such that said seat cushion is allowed to move to foremost and rear-most positions. 
     
     
       8. A seat device according to claim  1 , further comprises a locking means for locking said seat cushion at a position. 
     
     
       9. A seat device according to claim  1 , wherein said upper rail of each said seat slide mechanism is directly fixed to said seat cushion. 
     
     
       10. A seat arrangement comprising: 
       a seat having a cushion portion;  
       first and second guide rail members fixed to a lower surface of the cushion portion;  
       first and second legs having lower ends adapted to be fixed to a floor and upper ends respectively slidably engaged with the first and second guide rail members;  
       a third leg having an upper end fixedly connected to the lower surface of the cushion portion and a lower free end which is adapted to proximate the floor.  
     
     
       11. A seat arrangement as set forth in claim  10 , wherein the lower free end of the third leg is slidably received in a third guide rail member adapted to be fixed to the floor. 
     
     
       12. A seat arrangement as set forth in claim  11 , where the lower free end of the third leg has a rail member which is slidably received in a third guide rail member adapted to be fixed to the floor. 
     
     
       13. A seat arrangement as set forth in claim  11 , wherein the third guide rail is shorter than the first and second guide rails, and is located so as to substantially be concealed by the seat cushion portion. 
     
     
       14. A seat arrangement as set forth in claim  11 , wherein the length of the third guide rail member is ¼ to ½ of the distance between the first and second guide rail members. 
     
     
       15. A seat arrangement as set forth in claim  10 , wherein the lower free end of the third leg is provided with a caster which is adapted to roll on the floor.